121421320 has 32 divisors (see below), whose sum is σ = 273870720. Its totient is φ = 48448960.

The previous prime is 121421317. The next prime is 121421323. The reversal of 121421320 is 23124121.

It is an interprime number because it is at equal distance from previous prime (121421317) and next prime (121421323).

It is a junction number, because it is equal to n+sod(n) for n = 121421294 and 121421303.

It is not an unprimeable number, because it can be changed into a prime (121421323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13719 + ... + 20761.

It is an arithmetic number, because the mean of its divisors is an integer number (8558460).

Almost surely, 2^121421320 is an apocalyptic number.

121421320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121421320 is an abundant number, since it is smaller than the sum of its proper divisors (152449400).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121421320 is a wasteful number, since it uses less digits than its factorization.

121421320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7485 (or 7481 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 121421320 is about 11019.1342672644. The cubic root of 121421320 is about 495.1821524639.

Adding to 121421320 its reverse (23124121), we get a palindrome (144545441).

The spelling of 121421320 in words is "one hundred twenty-one million, four hundred twenty-one thousand, three hundred twenty".